Properties:

A rigid item usually in the form of an arm of various shapes and cross sections, containing two or more holes so spaced that one serves as a pivot with or without hubs and must have a definite means for securing to a shaft (such as threaded hole for set-screw, keyway(s), splines, serrations or some clamping device). The other hole(s) connect(s) to connecting link, rigid; wire rope assembly, single leg; or clevis, rod end; to provide transmission of movement to other parts of the mechanism. See also bell crank. For manually operated items see lever, manual control.